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Lancaster Laboratories Where quality is a science. Quality Control Summary Page 3 of 7 Client Name: Chevron Products Company Group Number: 787778 Reported: 12/11/01 at 05:48 PM Sample Matrix Quality Control MS MSD MS/MSD RPD BKG DUP DUP Analysis Name %REC %REC 'Limits RPD T MAX Conc Total Xylenes 130 69-140 Batch number: U013321AA Sample number(s): 3733543-3733550 Ethanol 99 109 70-130 10 30 Methyl t -butyl ether 96 110 69-134 6 30 di -Isopropyl ether 97 114 75-128 16 30 Ethyl t -butyl ether 96 112 73-123 15 30 t --Amyl methyl ether 94 108 69--126 14 30 t -Butyl alcohol 96 107 50-157 11 30 1,2-Dichloroethane 93 110 75-141 16 30 1,2-Dibromoethane 97 109 78-120 12 30 Batch number: U013321AB Sample number(s): 3733551-3733560 Ethanol 99 109 70-130 10 30 Methyl t -butyl ether 96 110 69-134 6 30 di -Isopropyl ether 97 114 75-128 16 30 Ethyl t -butyl ether 96 112 73-123 15 30 t -Amyl methyl ether 94 108 69-126 14 30 t -Butyl alcohol 96 107 50-157 11 30 1,2-Dichloroethane 93 110 75-141 16 30 2-Dibromoethane 97 109 78-120 12 30 tch number: U013331AA Sample number(s): 3733561-3733564,3733566 Ethanol 115 112 70-130 3 30 Methyl t -butyl ether 91 94 69-134 3 30 di -Isopropyl ether 96 99 75-128 4 30 Ethyl t -butyl ether 94 95 73-123 0 30 t -Amyl methyl ether 86 90 69-126 4 30 t -Butyl alcohol 92 95 50-157 3 30 1,2-Dichloroethane 90 93 75-141 4 30 1,2-Dibromoethane 87 91 78-120 4 30 Batch number: V013321AB sample number(s): 3733567-3733572 Ethanol 102 106 70-130 4 30 Methyl t -butyl ether 106 109 69-134 2 30 di -Isopropyl ether 106 108 75-128 2 30 Ethyl t -butyl ether 102 103 73-123 1 30 t -Amyl methyl ether 103 106 69-126 3 30 t -Butyl alcohol 99 97 50-157 2 30 1,2-Dichloroethane 101 105 75-141 4 30 1,2-Dibromoethane 97 99 78-120 2 30 Batch number: V013332AB Sample number(s): 3733565 Ethanol 86 82 70-130 5 30 Methyl t -butyl ether 95 92 69-134 3 30 di -Isopropyl ether 96 91 75-128 5 30 Ethyl t -butyl ether 89 87 73-123 2 30 t -Amyl methyl ether 90 88 69-126 2 30 t -Butyl alcohol 60 55 50-157 9 30 1,2-Dichloroethane 88 85 75-141 3 30 1,2-Dibromoethane 84 83 78-120 0 30 *- Outside of specification The result for one or both determinations was less than five times the LOQ. } The background result was more than four times the spike added. Lancaster Laboratories, Inc. M E M B E R 2425 New Holland Pike PO Box 12425 Lancaster, PA 176OS-2425 717-656-2300 Fax; 717-656-2681 Conc RPD Dup RPD Max 2216 ReV.9111100